Most important work of teacher is:

Teachers are individuals who have elaborate systems of knowledge for understanding problems in teaching and learning. They are experts who have control over various knowledge bases of teaching and learning and they use this knowledge to guide the science and art of their classroom instruction.

Key Points

Characteristics of an effective teacher-

• Organization and Clarity: Organization is reflected in arranging concepts and content to be taught in a systematic and orderly fashion to enable students to understand it better. The attempt is to create concept hierarchies that promote learning. Teachers who organize teaching work effectively by providing clear presentations and explanations tend to have students who learn more and also rate their teachers more positively. 
• Knowledge: Teachers who are firmly rooted in their subject knowledge make clearer presentations and recognize students' difficulties readily. They can handle the queries of their students effectively. 
• Warmth and Enthusiasm: Teachers who are warm and friendly inspire and instill positive attitudes and a love for learning in their students.

Hence, we conclude that the most important work of teachers is to organize teaching work.